Reasons for the corrosion of high-efficiency energy-saving multi-stage pump impellers

Category: Water pump knowledge

2025-07-21

High-efficiency energy-saving multi-stage pumps are widely used in various industrial fields. Their impellers are the core components of the pump, responsible for fluid delivery. However, during use, impellers are often subject to corrosion, which not only reduces the pump's efficiency but can also lead to equipment failure. The following analyzes the reasons for impeller corrosion in high-efficiency energy-saving multi-stage pumps.

I. Chemical Corrosion

When the pumped medium contains acidic or alkaline substances, these substances will react chemically with the impeller material, causing the material to corrode. Chemical corrosion is related to factors such as the pH value, concentration, and temperature of the medium.

II. Electrochemical Corrosion

In an aqueous environment containing conductive impurities, the impeller may corrode due to electrochemical action. This corrosion manifests as a tiny battery reaction on the metal surface, causing the metal to gradually dissolve.

III. Mechanical Corrosion

When solid particles in the fluid move at high speed within the pump, they will impact and rub against the impeller surface, causing the material to gradually wear away. This mechanical corrosion is related to factors such as the size, hardness, and flow rate of the particles.

IV. Oxidation Corrosion

In high-temperature, high-humidity environments, impeller materials may corrode due to oxidation. Especially in high-temperature liquids, the oxidation rate of metal materials will greatly increase.

V. Stress Corrosion

When the impeller is subjected to tensile stress and a corrosive medium simultaneously, stress corrosion will occur. This corrosion can cause cracks or even breakage in the impeller. In addition, vibrations generated during pump operation will also exacerbate the stress corrosion process.

VI. Water Quality Factors

Water quality is an important factor affecting impeller corrosion. Corrosive components in the water, such as chloride ions and sulfate ions, will damage the impeller material.

To reduce corrosion of high-efficiency energy-saving multi-stage pump impellers, corresponding measures need to be taken based on the above reasons. For example, selecting corrosion-resistant materials for manufacturing impellers; optimizing the pump's operating environment to reduce the risk of chemical and electrochemical corrosion; improving water quality to reduce the content of corrosive components; and reducing particle impact and friction in the fluid. In short, understanding the causes of impeller corrosion is crucial for preventing and solving corrosion problems.

Previous: Reasons for bearing aging in high-efficiency energy-saving multi-stage pumps

Next: What are some methods for efficient and energy-saving multi-stage pump irrigation and water diversion?

Contact Us

Free Hotline:0086-13307481676

Fixed telephone:0086-13307481676      

Mobile:0086-13307481676(WeChat)

E-mail:sales@sanchangpump.com